Membrane Rejection Levels

Membrane Rejection Levels

Characteristics of Thin Film Composite (TFC) Reverse Osmosis Membranes

Ion % Rejection* Ion % Rejection*
Calcium 93 - 99 Bromide 90 - 95
Sodium 92 - 98 Phosphate 95 - 98
Magnesium 93 - 98 Cyanide 90 - 97
Potassium 92 - 96 Sulfate 96 - 99
Manganese 96 - 98 Thiosulfate 96 - 98
Iron 96 - 98 Silicate 92 - 95
Aluminum 96 - 98 Silica 90 - 98
Copper 96 - 99 Nitrate 90 - 95
Nickel 96 - 99 Boron 50 - 70
Cadmium 93 - 97 Borate 30 - 50
Silver 93 - 96 Fluoride 92 - 95
Zinc 96 - 98 Polyphosphate 96 - 98
Mercury 94 - 97 Orthophosphate 96 - 98
Hardness (Ca & Mg) 93 - 97 Chromate 85 - 95
Radioactivity 93 - 97 Bacteria 99 +
Chloride 92 - 98 Lead 95 - 98
Ammonium 80 - 90 Arsenic 50 - 90

 

Characteristics of Cellulose Triacetate Reverse Osmosis Membranes

Ion % Rejection* Ion % Rejection*
Calcium 92 - 95 Bromide 85 - 90
Sodium 90 - 95 Phosphate 95 - 97
Magnesium 94 - 97 Cyanide 80 - 90
Potassium 85 - 95 Sulfate 96 - 98
Manganese 92 - 96 Thiosulfate 94 - 97
Iron 92 - 96 Silicate 80 - 90
Aluminum 95 - 98 Sulfite 94 - 96
Copper 96 - 98 Nitrate 50 - 70
Nickel 96 - 98 Chromium 94 - 96
Cadmium 95 - 97 Borate 25 - 50
Silver 90 - 95 Fluoride 85 - 90
Zinc 96 - 98 Ferrocyanide 96 - 98
Mercury 94 - 96 Bicarbonate 85 - 95
Stronium 95 - 97 Chromate 80 - 90
Barium 94 - 96 Selenium 90 - 95
Chloride 90 - 95 Lead 94 - 96
Ammonium 85 - 90 Arsenic 90 - 95